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Note 10 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Goodwill, Gross $ 132,800   $ 132,800   $ 120,400
Acquired Finite-Lived Intangible Asset, Residual Value 0   0    
Amortization of Intangible Assets 4,900 $ 4,800 14,600 $ 13,400  
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year 20,500   20,500    
Finite-Lived Intangible Asset, Expected Amortization, Year One 22,600   22,600    
Finite-Lived Intangible Asset, Expected Amortization, Year Two 22,300   22,300    
Finite-Lived Intangible Asset, Expected Amortization, Year Three 21,500   21,500    
Finite-Lived Intangible Asset, Expected Amortization, Year Four 17,600   17,600    
Final Mile Services [Member]          
Goodwill, Gross 111,600   111,600    
Integrated Capacity Solutions [Member]          
Goodwill, Gross 12,400   12,400    
Intermodal Business Segments [Member]          
Goodwill, Gross 8,800   8,800    
BNSF Logistics, Llc [Member]          
Goodwill, Gross 12,400   12,400    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 41,900   $ 41,900